Electrofusable Metal Conduit Coating for Leak-Tight Fueling Joints
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Solution Overview
Problem
Existing metal conduits used in fueling systems face challenges in electrofusion welding due to the limitations of corrosion-resistant coatings, such as low-density polyethylene, which fail to meet industry standard strength tests, necessitating the development of a conduit that can be electrofusion welded for secure connections in fueling installations.
Innovation Solution
A metal conduit with high-density polyethylene sections secured over the metal conduit, allowing for electrofusion welding, and optionally using polyamides as electrofusable materials, to create a fluid-tight seal that withstands industry-standard testing, with corrosion-resistant sections providing additional protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If low-density polyethylene corrosion-resistant coating is applied to metal conduit, then corrosion resistance is improved, but electrofusion welding strength fails to meet industry standards
Solution Approach 1:
The patent applies a multi-layer composite coating structure on metal conduit: an inner high-density polyethylene layer (0.06-0.12 inches thick) that is electrofusable and provides corrosion resistance, and an outer low-density polyethylene layer (0.002-0.006 inches thick) that provides additional corrosion protection. The inner HDPE layer is specifically designed to be electrofusable to meet welding strength requirements, while the outer LDPE layer provides enhanced corrosion resistance without interfering with the electrofusion process.
2Strength
If metal conduit is used to traverse sump walls, then structural strength and corrosion resistance are improved, but compatibility with polyethylene/fiberglass sumps deteriorates due to compression fitting requirements
Solution Approach 1:
The patent applies different coating properties to different regions of the metal conduit: the electrofusable HDPE coating sections are positioned at locations where electrofusion welding is required (such as at sump penetrations), while other sections may have different coating characteristics. This localized application of specific material properties allows the conduit to meet both structural requirements and compatibility requirements with polyethylene or fiberglass sumps through electrofusion welding rather than compression fittings.
3Ease of operation
If electrofusable sections are added to metal conduit, then electrofusion welding capability is improved, but device complexity increases due to multiple spaced sections with corrosion resistant spanning
Solution Approach 1:
The patent divides the conduit coating into distinct segments: electrofusable HDPE coating sections positioned at specific locations where welding is needed, and corrosion-resistant LDPE sections spanning between them. This segmentation allows the conduit to have electrofusion capability only where required, while maintaining corrosion resistance along the entire length, thereby reducing overall complexity compared to making the entire conduit electrofusable.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables successful electrofusion welding of the conduit, ensuring leak-tight and strong connections in fueling systems, meeting industry standards and providing corrosion resistance, thus enhancing the reliability and integrity of fueling installations.
Implementation Method 1
A metal conduit with high-density polyethylene sections secured over the metal conduit, allowing for electrofusion welding
Data Source
AI summary
A rigid conduit (for example, a metal conduit) featuring an electrofusable section secured to the rigid conduit to allow the rigid conduit to be electrofusion welded to another component of the fueling installation, such as a sump or further electrofusable conduit, is provided by the present disclosure. In certain exemplifications, multiple spaced electrofusable sections are provided on the rigid conduit, with corrosion resistant sections spanning the electrofusable sections in certain arrangements.